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Historical Arts and Casting has many of the castings for the original Pearson hardware. They are not inexpensive. Bronze, no aluminum. Here is the contact:
5580 W Bagley Park Rd.
West Jorday, UT 84088
(801) 280-2400eden@historicalarts.com

Good reports from those who have used Historical Arts (search Off Topic forum)

Smallest size with its more round shape will add about 6 more square inches of glass,
and may take little to rework the original hole to fit the Davey spigot. Guessing.
Inside, portlight has integral mounting flange that will match outside trim ring
for thru bolting. Assuming, don't know for a fact.

In the USA, the smallest Davey oval portlight priced $542 (R&W*).
Have not seen these first hand. (Midsize $770, $200 over uk)R & W Rope --- Fisheries Supply (OOS but equally insane $$$) --- Rig Rite Spartan.
(* this is a $142 mark up on the London price. Maybe lower cost if you import them!
Ask what they weigh and if they include the bug screen.) My last overseas order, UPS
took care of all the paperwork, and delivered to the front door. Should not have to
pay the 15% VAT, which is often included in an online UK site.

Have to talk with Historical Arts, who may or may not still have the molds.
They do not mention anywhere on site: marine/nautical.
Would guess they will be as expensive, if not more, if they have to start from scratch.
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